Web Reference: Even though Function components are preferred, there are no current plans on removing Class components from React. This section will give you an overview of how to use Class components in React. Oct 3, 2025 · Class components are ES6 classes that extend React.Component. They allow state management and lifecycle methods for complex UI logic. Used for stateful components before Hooks. Support lifecycle methods for mounting, updating, and unmounting. The render () method in React class components returns JSX elements describing the UI of the Application. Creating and nesting components React apps are made out of components. A component is a piece of the UI (user interface) that has its own logic and appearance. A component can be as small as a button, or as large as an entire page. React components are JavaScript functions that return markup:
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